Refactor to call ActOnFinishFullExpr on every full expression. Teach
ActOnFinishFullExpr that some of its checks only apply to discarded-value
expressions. This adds missing checks for unexpanded variadic template
parameter packs to a handful of constructs.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@172485 91177308-0d34-0410-b5e6-96231b3b80d8
Document that we should recognize attributes supported by gcc with C++11
[[gnu::...]] syntax

Pointed out by Richard Smith on the mailing list.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@172487 91177308-0d34-0410-b5e6-96231b3b80d8